Swing-link bearing for trucks.



s; A. BULLOCK.

SWING LINK BEARING FOR TRUCKS.

APPLICATION FILED APR.22, 1915.

1,150,741. Patented Aug. 1?, 1915.

'sUnL A. BULLOCK, or PHILADELPHIA, PENNSYLVANIA, Assienon fro THE BALD- a mi;

WIN LOCOMOTIVE W0 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA SNG-LII IK BEARING FOR TRUCKS;

Specification of Application filed April 22, 1915. Serial No. 23,177.

To all whom it may concern:

Be it known that I, SAMUEL A. Buttoc a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Swing-Link'Bearings for Trucks, of which the following 18 a specification. I I

One object of my invention is to improve the construction of the swing link bearings for trucks so that the swing of the spring link plate and bolster will be dampened.

A. further object of the invention is to so construct the parts that the weight of the car body will be used to dampen the swing.

.A still further object of the invention is to increase the frictional bearing surface of the parts so as to aid in dampening the swingfof the bolster and the car body, whether the bearing surfaces are concentric or eccentric.

In the accompanying drawings :Figure 1, is a transverse sectional view of suficient of a car truck to illu-stratemy invention; Fig. 2, is a view on the line a-a, Fig. 1, showing the frame and springs in section; Figs. 3 and 4, are perspective views of the shoe at the upper end of the swinglink; Fig. 5, is a perspective view of the-block on which the shoe rests and Fig. 6 is a view of a modification showing an extended concentric bearing face. 7

Referring to the drawings, 1 is the transom forming part of the frame of the truck.

2 is a recessed carrier secured rigidly to the frame and in the recess of this carrier is a block 3 having a curved seat 4, as illustrated in Fig. 5. y

5 is the bolster.

6 is the s ring plate.

7 is one of the springs located between the spring plate and the bolster, and on the under side of the end of the spring plate is a bearing 8 for the shoe 9 attached to the squared pin 10 which extends from one link 11 to the other.

12 is a pin from which the links 11 are suspended, this pin is square in the present instance and mounted on each end of the pin is a shoe 13.

The bearing surfaces of the shoes 9 and 13 on the block 3 and bearing 8 are eccentric, being on a greater radius than from the center of the pins. When the parts are in the central position, as illustrated in Fig. 1, the

two shoes rest snugly in their bearings but, as the bolster swings the shoes rock and the eccentric portions of the shoes ride upon the upper bearing surfaces of the block 3 and the surface of the bearing 8, respectively, and they tend to lift the bolster and the car body. This increased weight will tend to dampen the swing of the bolster and the car body and these parts will be returned to their normal positions. The shoes and their bearings may be modified considerably without departing from the essential features of the invention. In the present instance, on each shoe 13 and 9 is a projection 14: which enters the space between lugs 15 on the block 3 or bearing 8, which tend to hold the links in position. m

In Fig. 6 I have illustrated another modification of the invention in which the hear ing face of the shoe is concentric and has a wide bearing on the block, so that, as the link swings, the weight of the car will be used in connection with the increased area of the bearing surface to dampen the swing of the truck. In this construction, when the shoes are new they tend to rock on the blocks, but when they are worn a smooth surface is formed and they have a tendency to slide on the blocks, but in either case the swing of the bolster is dampened.

I claim 1. The combination in a truck, of a frame; a bearing block mounted in the frame and having a curved surface; a spring plank having a curved bearing surface on its under side; a link; a shoe at the upper end of the link resting on the bearing surface of the block; and a shoe onthe lower portion of the link supporting the spring plank and resting on the curved surface thereof.

2. The combination in a truck, of a frame; a recessed portion thereon;a block mounted in the recessed portion and having a curved bearing face; a spring plank having a curved bearing face at its under side; a link; a pivot pin at the upper end and at the lower end of the link; a shoe secured to the upper pivot pin and having an eccentric,

surface bearing upon the curved surface of the block; and a shoe secured to the lower link and also having an eccentric bearing surface restingagainst the bearing surface on the under surface of the spring plank.

3. The combination in a truck, of a frame;

'bearing blocks Secured to the frame; a

spring plank; links by which the plank is suspended from the frame; and an extended bearing surface between the links and the blocks and spring plank so that as the truck swings the extended bearing surface will increase the frictional resistance and will-dampen the swing of the truck.

4. The combination in a truck, of a frantic; a spring plank; links connecting the spring plank with the frame; eccentric and broad faced shoes on the link and bearing upon SAMUEL A. BULLOCK.

Witnesses WM. E. SHU'PE WM. A. BARR.- 

